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5 votes
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123456789011121314151617181920-example-1

2 Answers

3 votes
c because it is saying the one's opinion, and it is best not to in  formal research writing. Hope this helps!
User Juergen D
by
8.2k points
6 votes
C. It's not only first person but it's informal.
User Simlev
by
8.8k points

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